firewallmngr: handling for firewallmngr uci

• added handling for uci of firewallmngr
• compile time flag added to separate the compilation of uci based firewallmnge code

requested review from @rthakur

added 1 commit

• d0a30520 - firewallmngr: fix for new issue identified

Compare with previous version

removed review request for @rthakur

assigned to @vivek.dutta